OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
am+1, bm+1, cm+1 are primes and am|(N-1), bm|(N-1), cm|(N-1).
MATHEMATICA
CarmichaelNbrQ[n_] := ! PrimeQ@n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 1600000, PrimeQ[# +1] && PrimeQ[2# +1] && PrimeQ[61# +1] && CarmichaelNbrQ[(# +1) (2# +1) (61# +1)] &] (* Robert G. Wilson v, Jul 31 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Harvey Dubner (harvey(AT)dubner.com), Nov 14 2001
EXTENSIONS
a(8) onward from Robert G. Wilson v, Jul 31 2017
STATUS
approved